| I use the same logic to send out DTMF signal after connection. 
 I use SP2 to connect my asterisk box at extension 6109.
 
 Here is my extension.conf
 [CallingRule_obi110]
 exten => _816XXXXXXXX,1,Set(GLOBAL(hkno)=2**8${EXTEN:3}#)
 exten => _816XXXXXXXX,n,Dial(SIP/6109,,D(${hkno})r)
 
 When I press 816 + HK No, the dialplan will process and then dial out via OBi110 to PSTN line connect
 
 Same logic will allow you to connect GV and OBiTalk Circle of Trust
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